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People filter their faucet water to purify it further and to filter out any sediment in the water. It's also to improve taste and remove contaminants and thereby reducing risk of drinking unhealthy tap water

People sieve flour when baking to break apart any clumps of flour from entering the mix. Clumps of flour make it harder the combine and often result in clumps of dry flour in the finished bake which are unpleasant.

Explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.